Improvement in cut-offs



PATENT CEEIcE.

PETER J. JOECKEN, OF CLEVELAND, OHIO.

- IMPROVEMENT lN CUT-OFFS.

p Specification forming part of Letters Patent No. 154,869, datedSeptember B, 1874; application led July 9, 1874.

To all whom it may concern Be it known that I, PETER J. J oEeKEN, ofCleveland, in the county of Cuyahoga and State of Ohio, have invented anew and useful Improvement in Cut-Offs; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawing forming a part of thisspecification, in which- Figure l is a sectional elevation; Fig. 2, adetail view in side elevation 5 Fig. 3, a detail view in verticalsection.

The invention will first be fully described, in connection will all thatis necessary to a full understanding thereof, and then pointed out inthe claims.

A represents the chamber or cylinder, which is interposed between asteam-chest and engine-cylinder, so as to enable the supply of livesteam to the latter to be regulated by a governor. It has an inlet, a,from the steamchest, and au outlet to the engine-cylinder through portsa1 al. These are closed and opened wholly or partially by a slide-valve,B, that is apertured on top, and receives the end of an arm, c, of therock-shaft C, whereby the throw of the valve must correspond to thevarying arcs of vibration which the arm o is made to describe. Cl is anarm, and C2 a spring by which the arm c is brought back to a verticalposition, so as to cause the valve to cover the ports. On the rock-shaftC is keyed, and held by screw and nut, an oblong reetangular block, D,having edge-an ges d d, against which are secured loosely the yoke E, bya y plate, F. The yokeE is longer than the block D,is allowed to slidefreely up and down thereupon, and has on its bottom two cams, e e, re`

versed and conjoined diagonally. G is a lever, pivoted on a projectingstud, a2, of cylinder A, and having two upper-end cams, g g,corresponding to those of yoke E, and vibrated by a rod connected withan eccentric of main shaft. H is the governor-rod, which is lifted moreand more as the speed of machinery or the pressure of steam increasesand the balls h rise. I connect the lower end of this rod with the yokeE by a slotted bow, I, and crosspin J.

When there is a minimum of speed the yoke E projects, with its bottomcams, to its lowest point, remains longest in contact with the vibratingcams of lever G, and, consequently, is moved in its largest are ofvibration. As the arm c of rock-shaft is to the same extent actuated,the throw of valve is now greatest, and the ports are opened to theirfull extent. As soon, however, as the speed increases, and thegovernor-rod H is lifted, the yoke E is carried up, the time of contactof the cams e g lessened, and the throw of the valve B decreased. Thesupply of steam is thus cut olf as soon as an excess manifests itself onthe governor.

If the governor-belt should break it is necessary that the cams e gshould be promptly disconnected. In order to accomplish thisautomatically I use two levers, L M, connected by a strap, N, the formera lever of the first, and the latter a lever of the third, class, theone pivoted, at l, in upright O, and the other pivoted at the rear endof bar P. Q is a pivoted latch, which may be employed to lock the leverM down, when desired.

With this device, when the governor-belt breaks, and the rod H falls byits own gravity,

the lever L is actuated to lift the lever M, and with it the yoke E, sothat the cams e are carried out of reach of the still vibrating cam g,

-and the valve consequently caused to remain stationary over the ports.

I am aware that an arm vibrated from mainV shaft, in order to oscillateanother arm lifted by the governor, and thus made to regulate the throwof slide-valve, is old; but

What I claim is- 1. rIhe block I), yoke E, and bow I, combined withgovernor-rod H, as and for the purpose described.

2. The combination, with governor-rod l-I and bow I, of the lever L,strap N, and lever M, to move the cams e g out of contact when thegovernorbelt breaks.

PETER JOSEPH JOECKEN.

Witnesses:

P. L. BAUM, HOMER STRONG.

